Backend

MCP server patterns, Code Mode integration, tool building

Use when enhancing documentation, adding code comments, creating API docs, or improving technical documentation.

Backend development guidelines for Node.js/Express/TypeScript applications. Layered architecture (Routes → Controllers → Services → Repositories), error handling, validation, middleware patterns, database access, and testing. Use when creating routes, endpoints, APIs, controllers, services, repositories, middleware, or working with backend code.

This skill enables Claude to test load balancing strategies. It validates traffic distribution across backend servers, tests failover scenarios when servers become unavailable, verifies sticky sessions, and assesses health check functionality. Use this skill when the user asks to "test load balancer", "validate traffic distribution", "test failover", "verify sticky sessions", or "test health checks". It is specifically designed for testing load balancing configurations using the `load-balancer-tester` plugin.

Complete GitHub workflow for Claude Code on the web. ALL GitHub operations MUST use REST API (never gh CLI). Includes branch naming (claude/*-sessionId), push retry logic, PR/issue management via API, and complete workflows. Use for all GitHub interactions in Claude Code web environment.

Retrieve and extract content from URLs with AI-powered summarization and structured data extraction. Use for scraping web pages, extracting specific information, summarizing articles, or crawling websites with subpages.

Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Use when building MCP servers to integrate external APIs or services, whether in Python (FastMCP) or Node/TypeScript (MCP SDK).

Use when creating or modifying a CQRS Command (Save, Create, Update, Delete) or command handler in .NET backend.

Design and implement database indexes for optimal query performance. Use when creating tables, optimizing slow queries, or improving database performance.

Optimize ActiveRecord queries to prevent N+1 queries and improve performance. Use when experiencing slow queries, optimizing database access, or implementing eager loading strategies.

Authoritative reference for Anthropic products. Use when users ask about product capabilities, access, installation, pricing, limits, or features. Provides source-backed answers to prevent hallucinations about Claude.ai, Claude Code, and Claude API.

Advanced pytest patterns for Python backend testing. Use when dealing with async tests, complex fixtures, mocking strategies, database testing, or debugging flaky tests. Complements test-writer with deeper patterns.

GitHub Actionsのワークフローで使用できる式構文とコンテキストオブジェクトを専門とするスキル。${{ }}構文、演算子、リテラル、組み込み関数、および利用可能なすべてのコンテキスト（github, env, job, steps, runner, secrets, needs, matrix, inputs）を提供します。Anchors:• Continuous Delivery (Jez Humble) / 適用: パイプライン設計とCI/CD自動化 / 目的: 信頼性の高いワークフロー式の設計Trigger:Use when implementing conditional execution (if:), referencing step outputs, generating dynamic values, or utilizing context information (branch names, commit SHA, event types) in GitHub Actions workflows.Keywords: github actions, workflow, expressions, context, ${{ }}, if condition, matrix, secrets, steps output

Run isolated test environments for backend changes, manage test data, and verify API endpoints. Use when testing Python backend changes without interfering with production instances.

Your approach to handling backend tests. Use this skill when working on files where backend tests comes into play.

Get code context from repositories with examples and documentation. Use when you need code snippets, implementation examples, API usage patterns, or technical documentation for programming concepts, frameworks, or libraries.

Implement robust error handling in client-side JavaScript code to gracefully manage failures in static site operations. Use this skill when working with error scenarios in API calls, DOM manipulation, data parsing, and user interactions.

This skill enables Claude to validate application performance against defined budgets. It's useful for identifying performance regressions early in the development lifecycle. The skill is triggered when the user mentions "performance budget", "validate budget", "performance regression", or requests a check against performance metrics like "page load times", "bundle sizes", "API response times", or "Lighthouse scores". The plugin validates against predefined thresholds and alerts on violations. It is especially helpful in CI/CD pipelines to prevent performance degradation in production.

This skill automates the setup of distributed tracing for microservices. It helps developers implement end-to-end request visibility by configuring context propagation, span creation, trace collection, and analysis. Use this skill when the user requests to set up distributed tracing, implement observability, or troubleshoot performance issues in a microservices architecture. The skill is triggered by phrases such as "setup tracing", "implement distributed tracing", "configure opentelemetry", or "add observability to microservices".

This skill automates the setup of distributed tracing for microservices. It helps developers implement end-to-end request visibility by configuring context propagation, span creation, trace collection, and analysis. Use this skill when the user requests to set up distributed tracing, implement observability, or troubleshoot performance issues in a microservices architecture. The skill is triggered by phrases such as "setup tracing", "implement distributed tracing", "configure opentelemetry", or "add observability to microservices".